Malicious PDF — malware analysis report

Static analysis result for SHA-256 b866dcb154aaab7a…

MALICIOUS

PDF

90.0 KB Created: 2021-08-14 16:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d93b6ec385f8dcc21ecfe8df4d99ba26 SHA-1: bc7551e735d8dd6d3d21e716d26f9346ce4bba59 SHA-256: b866dcb154aaab7ac1ef8e5046d403205bad6f7b52363eb025032a6fef4b7baf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=how+to+work+kiinde+bottle+warmer
    • https://torgradio.ru/new/files/file/90148064603.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8feda91d3342d7344a230e91138b3a96/1337473787.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2d301b301822ac7cc17a027b39496950/pininaxelenarofinod.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/nuxerekuvijoseji.pdf
    • https://akapacha.com/userfiles/file/kexukavatubulelesixo.pdf
    • http://csc-0898.com/userfiles/file/20210713210009_knwhps.pdf
    • http://universalgroupautos.com/files/others/5301265535.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/555b15bb72b9fef1e965bb052a4cecf1/96040857250.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a559e71d7---73644735565.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/036105771e5e572172513f80ffdbce7a/votugidenabekoronuzejuv.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af951d500f1---73008712343.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a529aa1200---54856467745.pdf
    • https://cowichanseniors.ca/userfiles/file/xonopevojarejuf.pdf
    • https://chasehr.in/userfiles/file/31332859573.pdf
    • http://gallery4walls.com/upload/editer/file/50079661238.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a43a86307---nonunigasovozu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529bc63ca---betojozexinigi.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/xivugapizetinaxesi.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/3300fe131a78cb5710532622d551451a/napusokonagokexuseketofin.pdf
    • http://vanxuantravel.com/upload/files/kinivasawanalusatakaz.pdf
    • https://taxforce.nl/userfiles/files/janebokixe.pdf
    • http://esthebel.de/userfiles/file/17872817551.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5errkvihf3ovg9r1h0dqn297ou/58829858065.pdf
    • https://abugfreemind.com/userfiles/file/mavan.pdf
    • http://zkojicin.cz/userfiles/file/zifovofowabatuweje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc58.bin
7dfda18de9a8617753a84132ebe27ca87b01596ddffa7e384bba748e83a4fe23
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10552 bytes
font_01_sfnt_off00011455.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 16792 bytes
font_02_sfnt_off00012c67.bin
4e809a20d541ef211151128e6f39d6b2d85702306a2d45d408fcdc49ceade5e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 17412 bytes